Backup to Backblaze (over S3) fails with a 'write error'

[rverton]

Hi,
this error occurred a few times in the past and now it happens most of the time. It's hard for me to conclude whats going wrong here because I just get a 'write error' now. I did not change any settings and a backup:list and backup:clean still work as it should.

When executing a backup:run, the output is:

$ php artisan backup:run
Starting backup...
Dumping database myproject...
Determining files to backup...
Zipping 3308 files and directories...
Created zip containing 3308 files and directories. Size is 202.59 MB
Copying zip to disk named b2-s3...
Copying zip failed because: There was an error trying to write to disk named `b2-s3`.
Backup completed!

This is the error I'm getting:

Fehlermeldung: There was an error trying to write to disk named b2-s3

Fehlerverfolgung: #0 /home/forge/myproject.com/vendor/spatie/laravel-backup/src/BackupDestination/BackupDestination.php(100): Spatie\Backup\Exceptions\InvalidBackupDestination::writeError()
#1 /home/forge/myproject.com/vendor/spatie/laravel-backup/src/Tasks/Backup/BackupJob.php(272): Spatie\Backup\BackupDestination\BackupDestination->write()
#2 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Collections/Traits/EnumeratesValues.php(234): Spatie\Backup\Tasks\Backup\BackupJob->Spatie\Backup\Tasks\Backup{closure}()
#3 /home/forge/myproject.com/vendor/spatie/laravel-backup/src/Tasks/Backup/BackupJob.php(282): Illuminate\Support\Collection->each()
#4 /home/forge/myproject.com/vendor/spatie/laravel-backup/src/Tasks/Backup/BackupJob.php(155): Spatie\Backup\Tasks\Backup\BackupJob->copyToBackupDestinations()
#5 /home/forge/myproject.com/vendor/spatie/laravel-backup/src/Commands/BackupCommand.php(56): Spatie\Backup\Tasks\Backup\BackupJob->run()
#6 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): Spatie\Backup\Commands\BackupCommand->handle()
#7 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Container/Util.php(40): Illuminate\Container\BoundMethod::Illuminate\Container{closure}()
#8 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(93): Illuminate\Container\Util::unwrapIfClosure()
#9 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(37): Illuminate\Container\BoundMethod::callBoundMethod()
#10 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Container/Container.php(651): Illuminate\Container\BoundMethod::call()
#11 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Console/Command.php(136): Illuminate\Container\Container->call()
#12 /home/forge/myproject.com/vendor/symfony/console/Command/Command.php(299): Illuminate\Console\Command->execute()
#13 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Console/Command.php(121): Symfony\Component\Console\Command\Command->run()
#14 /home/forge/myproject.com/vendor/spatie/laravel-backup/src/Commands/BaseCommand.php(16): Illuminate\Console\Command->run()
#15 /home/forge/myproject.com/vendor/symfony/console/Application.php(978): Spatie\Backup\Commands\BaseCommand->run()
#16 /home/forge/myproject.com/vendor/symfony/console/Application.php(295): Symfony\Component\Console\Application->doRunCommand()
#17 /home/forge/myproject.com/vendor/symfony/console/Application.php(167): Symfony\Component\Console\Application->doRun()
#18 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Console/Application.php(92): Symfony\Component\Console\Application->run()
#19 /home/forge/myproject.com/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(129): Illuminate\Console\Application->run()
#20 /home/forge/myproject.com/artisan(37): Illuminate\Foundation\Console\Kernel->handle() #21 {main}

Application name: Camping Brötchen
Backup name: cb-laravel-backup
Disk: b2-s3
Newest backup size: 202.6 MB
Number of backups: 1
Total storage used: 202.6 MB
Newest backup date: 2021/10/28 19:47:08
Oldest backup date: 2021/10/28 19:47:08

When I execute this a few times, most of the times it fails, a few times it works. I watched CPU/RAM while doing this, I'm not running out of resources here. Any idea how I can debug this further?

Some version info:

PHP 7.4.13
laravel/framework                   v8.55.0 The Laravel Framework.
spatie/laravel-backup               6.16.5  A Laravel package to backup your application
Ubuntu system, managed by forge

Greetings